Thursday

January 29, 2015

January 29, 2015

Posted by **Jessie** on Thursday, December 19, 2013 at 2:44pm.

1. two very large cruise ships each have a mass of 415000 tonnes. If they were docked side by side, 1.0m apart, their centres would be 60m apart. What is the force of gravitational attraction putting them together? (hint: 1 tonne=1000kg)

2. On Earth, the gravitational field intensity is 9.8 N/kh. Mercury has a mass of 3.28x10^23kg abd a radius of 2.57x10^6m/ Calculate the gravitational field intensity on Mercury N/kg.

3. What would the weight of the dog be if it was taken to Mercury? (the weight of the dog is 245N and the mass is 25kg)

for #1 I got 3x10^-9, for #2 i got 8.5x10^15 and for #3 I got 2.1x10^17. I don't think I got these answers correct.

- Physics 11 Forces Unit -
**Elena**, Thursday, December 19, 2013 at 3:44pm1.

F =G•m₁•m₂/R²

the gravitational constant G =6.67•10⁻¹¹ N•m²/kg²,

F =G•m₁•m₂/R²=

=6.67•10⁻¹¹•(4.15•10⁸)²/60²=3191 N

2.

g`=GM/R²=

=6.67•10⁻¹¹•3.28•10²³/(2.57•10⁶)²=3.31 N/kg

3.

W(Mercury)=mg`=25•3.31=82.75 N

**Answer this Question**

**Related Questions**

Honors Chemistry - I'm doing what's called "test repair" for my class where we ...

Physics - With your equations, I solved for the two unknown variables and got ...

Physics - A string is 37.5 cm long and has a mass per unit length of 5.95 10-4 ...

Math - I need help with two problems. Just want to make sure that the answers I ...

english-iambic tetrameter - I have to write two lines of poetry in iambic ...

Science. Check answers - 1. True or False: If the net force of an object is 0 N...

Science help! URGENT. Check answers - 1. True or False: If the net force of an ...

Algebra II - In this set of eight problems, we have to match each equation with ...

Advanced Maths (Vectors) AQA Level, please help? - Two ships, A and B st out ...

calculus - I'm not sure where to start on these two problems, so any help is ...